Alain Ghignone/ BIA / Red-backed Shrike (Lanius collurio) mother feeding fledgling, Aosta Valley, Italy

Alain Ghignone/ BIA / Great Crested Grebe (Podiceps cristatus) pair feeding chick, Piedmont, Italy

Donald M. Jones / Hairy Woodpecker (Picoides villosus) male with prey at nest cavity entrance, western Montana

Andy Trowbridge / Great Grey Owl (Strix nebulosa) adult bringing food to chicks on nest. Nest 'frame' is manmade. Ostersund, Sweden. June.

Steve Gettle / Barn Swallow (Hirundo Rustica) feeding chicks in nest, Michigan

Steve Gettle / Barn Swallow (Hirundo Rustica) feeding, Michigan

Tom Vezo / Acorn Woodpecker (Melanerpes formicivorus) female bringing food to nest cavity, Madera Canyon, Arizona

Kim Taylor / European robin (Erithacus rubecula) bringing food to its nest. UK

Jim Brandenburg / Bald Eagle (Haliaeetus leucocephalus) bringing fish to mate in nest, Northwoods, Minnesota

Staffan Widstrand / Black Tern (Chlidonias nigra) bringing food for its on the floating vegetation in the Nemunas Delta Nature Reserve, Lithuania.

Sven Zacek / Ural owl (Strix uralensis) male bringing food to the nesting female, Tartumaa county, Southern Estonia. April

Donald M. Jones / Bullock's Oriole (Icterus bullockii) parent with prey at nest with begging chicks, Montana